Bonus Stage

After you complete the game, return to Rivendell. Travel to the secret room behind the waterfall (use "Set Destination" on "Middle Earth" to help you find it if you haven't been there before). There's a mithril brick in this room too. As you walk in, you will see the blue quest arrow. Walk into it to begin the bonus stage.

As in most LEGO games, the objective of the Bonus Stage is to collect as many studs as you can. However, the studs are tight, and nearly everything must be destroyed to get the one million. Besides sheer destruction, here are the things you will need to do:

Build Barad-Dur by hitting Mount Doom and assembling the bits that come out. After the Eye is completed, finish off Mount Doom.

At Lothlorien, you will need a jumper (an elf, or equip the mithril spring boots) to get on the tightrope to lop off the head of the first Argonath. You will also need to jump to the top of the tree houses to destroy them.Note: Most tall buildings require you to start your destruction at the top and work down. This includes these tree houses.

Enter Moria and destroy everything. In the upper chamber, destroy the lego wall on the left-hand side. You will receive the crank to destroy the second Argonath head.

Use the Berserker to blow up the mithril base of Orthanc (AKA, Isengard). Then you can destroy that tower.

You get extra blue studs if you ride the oliphant around.

You can destroy all standard houses, trees, and plants. The hall of the Rohirrim is partly indestructible (to my knowledge) as well as parts of Minas Tirith and Helm's Deep.